On a problem of walks
Annales de l'Institut Fourier, Volume 49 (1999) no. 3, p. 905-919

In 1995, F. Jaeger and M.-C. Heydemann began to work on a conjecture on binary operations which are related to homomorphisms of De Bruijn digraphs. For this, they have considered the class of digraphs G such that for any integer k, G has exactly n walks of length k, where n is the order of G. Recently, C. Delorme has obtained some results on the original conjecture. The aim of this paper is to recall the conjecture and to report where all the authors arrived.

En 1995, F. Jaeger et M.-C. Heydemann commencèrent à étudier une conjecture sur les opérations binaires apparentées aux homomorphismes de graphes de De Bruijn orientés. À cet effet, ils examinèrent la classe des graphes orientés G tels que pour tout entier k, G ait exactement n chemins de longueur k, où n est l’ordre de G. C. Delorme a apporté récemment quelques vues sur la conjecture d’origine. Le but de cet article est de décrire la conjecture et de faire le point sur les acquis.

     author = {Delorme, Charles and Heydemann, Marie-Claude},
     title = {On a problem of walks},
     journal = {Annales de l'Institut Fourier},
     publisher = {Association des Annales de l'institut Fourier},
     volume = {49},
     number = {3},
     year = {1999},
     pages = {905-919},
     doi = {10.5802/aif.1698},
     zbl = {0922.05031},
     mrnumber = {2000h:05096},
     language = {en},
     url = {http://www.numdam.org/item/AIF_1999__49_3_905_0}
Delorme, Charles; Heydemann, Marie-Claude. On a problem of walks. Annales de l'Institut Fourier, Volume 49 (1999) no. 3, pp. 905-919. doi : 10.5802/aif.1698. http://www.numdam.org/item/AIF_1999__49_3_905_0/

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